package com.xqq.lottery.view;

import java.util.Locale;

import com.xqq.lottery.R;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.graphics.Paint.Style;
import android.os.Build;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.HorizontalScrollView;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.TextView;

@SuppressLint("NewApi")
public class PagerSlidingTabStrip extends HorizontalScrollView {

	public interface IconTabProvider{
		public int getPageIconResId(int position);
	}
	
	private static final int [] ATTRS = new int []{
		android.R.attr.textSize,
		android.R.attr.textColor
	};
	
	private LinearLayout.LayoutParams defaultTabLayoutParams;
	private LinearLayout.LayoutParams expandedTabLayoutParams;
	
	private final PageListener pageListener =new PageListener();
	private OnPageChangeListener delegatePageListener;
	
	private LinearLayout tabsContainer;
	private ViewPager pager;
	
	private int tabCount;
	
	private int currentPosition = 0;
	private float currentPositionOffset = 0f;
	
	private Paint rectPaint;
	private Paint dividerPaint;
	
	private int indicatorColor = 0xFF666666;
	private int underlineColor = 0x1A000000;
	private int dividerColor = 0x1A000000;
	
	private boolean shouldExpand = false;
	private boolean textAllCaps = true;
	
	private int scrollOffset = 52;
	private int indicatorHeight = 8;
	private int underlineHeight = 2;
	private int dividerPadding = 12;
	private int tabPadding = 24;
	private int dividerWidth = 1;
	
	private int tabTextSize = 12;
	private int tabTextColor = 0xFF666666;
	private Typeface tabTypeface = null;
	private int tabTypefaceStyle = Typeface.BOLD;
	
	private int lastScrollX = 0;
	
	private int tabBackgroundResId = R.drawable.background_tab;
	
	private Locale locale;
	
	public PagerSlidingTabStrip(Context context, AttributeSet attrs,
			int defStyle) {
		super(context, attrs, defStyle);
		setFillViewport(true);
		setWillNotDraw(false);
		
		tabsContainer =new LinearLayout(context);
		tabsContainer.setOrientation(LinearLayout.HORIZONTAL);
		tabsContainer.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
		addView(tabsContainer);
		
		DisplayMetrics dm = getResources().getDisplayMetrics();
		scrollOffset = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, scrollOffset, dm);
		indicatorHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, indicatorHeight, dm);
		underlineHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, underlineHeight, dm);
		dividerPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerPadding, dm);
		tabPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabPadding, dm);
		dividerWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerWidth, dm);
		tabTextSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, tabTextSize, dm);
	    
		TypedArray a = context.obtainStyledAttributes(attrs,ATTRS);
		tabTextSize = a.getDimensionPixelSize(0, tabTextSize);
		tabTextColor = a.getColor(1, tabTextColor);
		a.recycle();
		
		a = context.obtainStyledAttributes(attrs,R.styleable.PagerSlidingTabStrip);
		indicatorColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsIndicatorColor, indicatorColor);
		underlineColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsUnderlineColor, underlineColor);
		dividerColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsDividerColor, dividerColor);
		indicatorHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsIndicatorHeight, indicatorHeight);
		underlineHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsUnderlineHeight, underlineHeight);
		dividerPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsDividerPadding, dividerPadding);
		tabPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsTabPaddingLeftRight, tabPadding);
		tabBackgroundResId = a.getResourceId(R.styleable.PagerSlidingTabStrip_pstsTabBackground, tabBackgroundResId);
		shouldExpand = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsShouldExpand, shouldExpand);
		scrollOffset = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsScrollOffset, scrollOffset);
		textAllCaps = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsTextAllCaps, textAllCaps);
		
		a.recycle();
		
		rectPaint = new Paint();
		rectPaint.setAntiAlias(true);   //抗锯齿
		rectPaint.setStyle(Style.FILL);   //设置画笔的风格
		
		dividerPaint = new Paint();
		dividerPaint.setAntiAlias(true);
		dividerPaint.setStrokeWidth(dividerWidth);
		
		defaultTabLayoutParams =new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.MATCH_PARENT);
		expandedTabLayoutParams = new LinearLayout.LayoutParams(0, LayoutParams.MATCH_PARENT, 1.0f);
	    
		if(locale  == null){
			locale = getResources().getConfiguration().locale;
		}
	}

	public PagerSlidingTabStrip(Context context, AttributeSet attrs) {
		this(context,attrs,0);
	}

	public PagerSlidingTabStrip(Context context) {
		this(context,null);
	}
	
	public void setViewPager(ViewPager pager){
		this.pager = pager;
		if(pager.getAdapter()  == null){
			throw new IllegalStateException("ViewPager does not have adapter instance.");
		}
		pager.setOnPageChangeListener(pageListener);
	}
	
	public void setOnPageChangeListener(OnPageChangeListener listener){
		this.delegatePageListener = listener;
	}
	
	public void notifyDataSetChanged(){
		tabsContainer.removeAllViews();
		tabCount = pager.getAdapter().getCount();
		
		for(int i=0;i < tabCount; i++){
			if(pager.getAdapter() instanceof IconTabProvider){
				addIconTab(i,((IconTabProvider)pager.getAdapter()).getPageIconResId(i));
			}else{
				addTextTab(i, pager.getAdapter().getPageTitle(i).toString());
			}
		}
		
		updateTabStyles();
		
		getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
			
			@Override
			public void onGlobalLayout() {
				if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
					getViewTreeObserver().removeGlobalOnLayoutListener(this);
				} else {
					getViewTreeObserver().removeOnGlobalLayoutListener(this);
				}

				currentPosition = pager.getCurrentItem();
				scrollToChild(currentPosition, 0);
			}
		});
	}
	
	
	private class PageListener implements OnPageChangeListener{

		/**
		 * state = 1 正在滑动
		 * state = 2滑动完毕 
		 * state = 0什么都没做
		 */
		@Override
		public void onPageScrollStateChanged(int state) {
			
		}

		/**
		 * position 当前页面，及你点击滑动的页面
		 * positionOffset 当前页面偏移的百分比
		 * positionOffsetPixels 当前页面偏移的像素位置
		 */
		@Override
		public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
			
		}

		/**
		 * 跳转完成后调用
		 */
		@Override
		public void onPageSelected(int position) {
			
		}
		
	}
	
	private void addTab(final int position,View tab){
		tab.setFocusable(true);
		tab.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				pager.setCurrentItem(position);
			}
		});
		tab.setPadding(tabPadding, 0, tabPadding, 0);
		tabsContainer.addView(tab,position,shouldExpand? expandedTabLayoutParams:defaultTabLayoutParams);
	}
	

	private void addIconTab(final int position, int resId) {
		ImageButton tab = new ImageButton(getContext());
		tab.setImageResource(resId);
		addTab(position, tab);
	}
	
	private void addTextTab(final int position, String title) {

		TextView tab = new TextView(getContext());
		tab.setText(title);
		tab.setGravity(Gravity.CENTER);
		tab.setSingleLine();

		addTab(position, tab);
	}
	
	@SuppressLint("NewApi")
	private void updateTabStyles(){
		for(int i=0;i< tabCount; i++){
			View v = tabsContainer.getChildAt(i);
			v.setBackgroundResource(tabBackgroundResId);
			if(v instanceof TextView){
				TextView tab = (TextView) v;
				tab.setTextSize(TypedValue.COMPLEX_UNIT_PX, tabTextSize);
				tab.setTypeface(tabTypeface, tabTypefaceStyle);
				tab.setTextColor(tabTextColor);
				if (textAllCaps) {
					if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
						tab.setAllCaps(true);
					} else {
						tab.setText(tab.getText().toString().toUpperCase(locale));
					}
				}
			}
		}
	}
	
	private void scrollToChild(int position,int offset){
		if(tabCount == 0){
			return;
		}
		int newScrollX = tabsContainer.getChildAt(position).getLeft() + offset;
	    
		if(position > 0 || offset > 0){
			newScrollX -= scrollOffset;
		}
		
		if (newScrollX != lastScrollX) {
			lastScrollX = newScrollX;
			scrollTo(newScrollX, 0);
		}
	}
	
	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
	}

}
